[rilmodem] Set service class to 0 in call waiting query

Set service class to 0 in call waiting query as certain
operators can reject the query with specific service class

Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
rilmodem: cancel USSD + minor style fix

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
Merge pull request #80 from ptakalok/master

[rilmodem] Set service class to 0 in call waiting query
Merge pull request #81 from jpoutiai/master

rilmodem: cancel USSD + minor style fix
gril:fix queue removing in cancel group + style fixes

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[rilmodem] Add support for RIL_REQUEST_SCREEN_STATE request

Support for RIL_REQUEST_SCREEN_STATE request will decrease power
consumption as RILD will notify the baseband to suppress certain
notifications (eg. signal strength and changes in LAC/CID, etc.).
Implementation listens to MCE's "display_status_ind" DBus signal for
sending  RIL_REQUEST_SCREEN_STATE.

Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
Merge pull request #82 from jpoutiai/master

gril:fix queue removing in cancel group + style fixes
Merge pull request #83 from ptakalok/master

[rilmodem] Add support for RIL_REQUEST_SCREEN_STATE request
sim: fix ofono crash when pin is blocked

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[rilmodem] Support for voice mailbox

Add support for voice mailbox (CPHS and MBDN). Enables speed dial to
voice mailbox from dialer and importing voice mailbox number to Settings
application.

Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
Merge pull request #84 from jpoutiai/master

sim: fix ofono crash when pin is blocked
Merge pull request #85 from ptakalok/master

[rilmodem] Support for voice mailbox